43424809 has 4 divisors (see below), whose sum is σ = 43554004. Its totient is φ = 43295616.

The previous prime is 43424779. The next prime is 43424819. The reversal of 43424809 is 90842434.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23309584 + 20115225 = 4828^2 + 4485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43424809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43424819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64092 + ... + 64765.

It is an arithmetic number, because the mean of its divisors is an integer number (10888501).

Almost surely, 2^43424809 is an apocalyptic number.

It is an amenable number.

43424809 is a deficient number, since it is larger than the sum of its proper divisors (129195).

43424809 is a wasteful number, since it uses less digits than its factorization.

43424809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129194.

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 43424809 is about 6589.7502987594. The cubic root of 43424809 is about 351.4897290789.

The spelling of 43424809 in words is "forty-three million, four hundred twenty-four thousand, eight hundred nine".